Trichopria anastrephae Lima and Pachycrepoideus vindemmiae (Rondani) naturally occur together with the pest Drosophila suzukii (Matsumura) in Brazil. Due to their co-occurrence, it is important to understand competitive interactions between these pupal parasitoids and how this may impact D. suzukii parasitism levels. Thus, the aim of the study was to evaluate the interspecific competition between T. anastrephae and P. vindemmiae. Bioassays were performed with and without time advantage, with different exposure (treatments) of D. suzukii pupae to parasitoid species. Verified that there was a higher parasitism and emergence rate of T. anastrephae adults. This was not observed for P. vindemmiae that decreases the parasitism rate in the presence of T. anastrephae. In strawberry fruits bioassay, T. anastrephae females showed capacity to parasitize pupae of D. suzukii inside strawberry fruits. However, P. vindemmiae had a lower parasitism rate and consequently, fewer insects emerged when used alone or associated with the presence of T. anastrephae. Therefore, we can conclude that there is interspecific competition between T. anastrephae and P. vindemmiae in D. suzukii pupae, with T. anastrephae having a higher competitive advantage.

中文翻译：

---

Trichopria anastrephae 寄生（膜翅目：Drosophilidae）和 Pachycrepoideus vindemmiae（膜翅目：Pteromalidae）寄生于铃木果蝇（双翅目：果蝇科）

Trichopria anastrephae Lima 和 Pachycrepoideus vindemmiae (Rondani) 在巴西自然与害虫 Drosophila suzukii (Matsumura) 一起出现。由于它们的共同出现，了解这些蛹寄生物之间的竞争相互作用以及这可能如何影响 D. suzukii 寄生水平非常重要。因此，该研究的目的是评估 T. anastrephae 和 P. vindemmiae 之间的种间竞争。生物测定在有和没有时间优势的情况下进行，D. suzukii 蛹对寄生物种的暴露（处理）不同。验证了按实蝇成虫的寄生率和羽化率较高。这对于在 T. anastrephae 存在下降低寄生率的 P. vindemmiae 没有观察到。在草莓果实生物测定中，T. anastrephae 雌性表现出在草莓果实中寄生 D. suzukii 蛹的能力。然而，P. vindemmiae 的寄生率较低，因此，单独使用或与 T. anastrephae 的存在相关时，出现的昆虫较少。因此，我们可以得出结论，在 D. suzukii 蛹中，按实蝇与 P. vindemmiae 之间存在种间竞争，其中按实蝇具有更高的竞争优势。